Why doesn't my dog have a belly button?
Dogs have belly buttons because they're placental mammals.
When puppies are developing inside their mother's womb the nutrients and oxygen they need are passed from mother to baby via the umbilical cord.
The belly button itself is just the scar leftover from where the umbilical cord was removed after birth.
When you take all kinds of dogs into consideration, an average litter ranges between six and ten puppies.
In the case of your little Yorkie, she is likely to give birth to three or five pups on the higher side.
However, some dogs can pop out one puppy depending on various factors.
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